(19)
(11) EP 2 110 687 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.12.2009 Bulletin 2009/51

(43) Date of publication A2:
21.10.2009 Bulletin 2009/43

(21) Application number: 09166404.5

(22) Date of filing: 24.01.2000
(51) International Patent Classification (IPC): 
G01V 3/28(2006.01)
(84) Designated Contracting States:
FR GB

(30) Priority: 28.01.1999 US 238832

(62) Application number of the earlier application in accordance with Art. 76 EPC:
00908351.0 / 1155343

(71) Applicant: Halliburton Energy Services, Inc.
Texas 75006 (US)

(72) Inventor:
  • Bittar, Michael
    Houston, TX 77064 (US)

(74) Representative: Jennings, Michael John et al
A.A. Thornton & Co. 235 High Holborn
London, WC1V 7LE
London, WC1V 7LE (GB)

   


(54) Electromagnetic wave resistivity tool having tilted antenna


(57) This invention is directed to a method and apparatus for determining at least one property of an earth formation. The present invention accomplishes this objective by using an antenna configuration in which at least one of a transmitter antenna (T1) and a receiver antenna (R1) are oriented in a plane that is not orthogonal to the tool axis. Preferably, either the transmitter or the receiver is mounted in a conventional orientation in a first plane that is normal to the tool axis, and the other antenna is mounted in a second plane that is not parallel to the first plane.







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